Hi there,
Welcome to planDisney and thank you so much for this question! My son is a huge Zootopia fan, so I can definitely relate.
I'm happy to share with you that both Judy Hopps and Nick Wilde are regulars at
Disney California Adventure Park! I have seen them there on my last three visits - they've shown up multiple times in the exact same location.
You'll want to head toward the pathway near
Embarcadero Gifts across from
The Little Mermaid - Ariel's Undersea Adventure. In this little pathway, you'll see the big water wheel of
Grizzly River Run on one end and the entryway to
Pixar Pier down in the opposite direction.
Judy and Nick usually show up right near the stroller parking area across from the restrooms here! I've noticed them multiple times throughout the day in this spot and they absolutely love meeting and taking pictures when they stop by.
Additionally, if you don't already have it, I'd recommend downloading the
Disneyland mobile app! If you head to the map page (the map pin icon in the main menu navigation bar), you can filter specifically for Characters!
When in this filtered view, I like to also tap the "Show List" option so you can see a scrollable list of all the characters you're likely to run into throughout the parks. If you select a character, it will give you more information on when to find them and the windows of time that you're most likely to run into them. It's been such a huge help when visiting with my family on recent trips.
Thanks again for your question - I hope you and your son have such a fun trip. Say hello to Judy for me!
Have a Magical Day,
Greg